Awesome

network-address

get the local network address of your machine

npm install network-address

it is easy to use

var address = require('network-address')

console.log(address())      // prints something like 192.168.3.102
console.log(address.ipv6()) // prints something like fc00::5137:ecb:55be:c2fc

it is also available as a command line tool

npm install -g network-address

you are now able to run network-address in your terminal